Issue 44, 2022

Defect-rich graphene-coated metamaterial device for pesticide sensing in rice

Abstract

Performing sensitive and selective detection in a mixture is challenging for terahertz (THz) sensors. In light of this, many methods have been developed to detect molecules in complex samples using THz technology. Here we demonstrate a defect-rich monolayer graphene-coated metamaterial operating in the THz regime for pesticide sensing in a mixture through strong local interactions between graphene and external molecules. The monolayer graphene induces a 50% change in the resonant peak excited by the metamaterial absorber that could be easily distinguished by THz imaging. We experimentally show that the Fermi level of the graphene can be tuned by the addition of molecules, which agrees well with our simulation results. Taking chlorpyrifos methyl in the lixivium of rice as a sample, we further show the molecular sensing potential of this device, regardless of whether the target is in a mixture or not.

Graphical abstract: Defect-rich graphene-coated metamaterial device for pesticide sensing in rice

Supplementary files

Article information

Article type
Paper
Submitted
23 Sep 2022
Accepted
30 Sep 2022
First published
07 Oct 2022
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2022,12, 28678-28684

Defect-rich graphene-coated metamaterial device for pesticide sensing in rice

W. Xu, Q. Wang, R. Zhou, S. Hameed, Y. Ma, Lijuan Xie and Y. Ying, RSC Adv., 2022, 12, 28678 DOI: 10.1039/D2RA06006J

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